In Julia you use vcat to add or append or concatenate a row of data to a Julia DataFrame.

Example:

julia> mydf = DataFrame(X=[0:10],Y=[100:110])
11x2 DataFrame:
X Y
[1,] 0 100
[2,] 1 101
[3,] 2 102
[4,] 3 103
[5,] 4 104
[6,] 5 105
[7,] 6 106
[8,] 7 107
[9,] 8 108
[10,] 9 109
[11,] 10 110

julia> mydf = vcat(mydf,DataFrame(X=12,Y=15))
12x2 DataFrame:
X Y
[1,] 0 100
[2,] 1 101
[3,] 2 102
[4,] 3 103
[5,] 4 104
[6,] 5 105
[7,] 6 106
[8,] 7 107
[9,] 8 108
[10,] 9 109
[11,] 10 110
[12,] 12 15